Improvement in wrenches



R.- H. MGCUBMICK W; R. BAKER.

Wrench.

Patented luly 27,1875.

TV1 TJV' ESSE S wAsmNeToN D u STATEs ATENT ROBERT HALL MCCORMICK AND WILLIAM R. BAKER, OF CHICAGO, ILLINOIS; SAID BAKER ASSIGNOR TO SAID MCCORMICK.

IMPROVEMENT IN WRENCHES.

Specification forming part of Letters Patent No. 166,020, dated uly 27, 1875; application iled April 13, 1875.

To all whom it lmay concern:

Be it known that we, ROBERT HALL Mo (loRMrcK and WM. R. BAKER, both of Chicago, in the county of Cook and State of Illinois, have invented a certain new and useful'Improvement in Wrenches, of whichv the following is a specication Our invention relates to wrenches of that class in which one portion is movable or ad justable upon the other by means of a screwnut, and has for its object to cheapen and simplify their manufacture. To this end our invention consists in providing the main portion of the Wrench with flanges on its top edge next to its head, and with a longitudinal groove in its outer end, and the movable portion with grooves formed in overlapping flanges thereon, and a depending tongue on its outer end, whereby the parts are connected together, and the heads or jaws thereof adapted lto be forced together or drawn apart by a screw-nut working on the main portion of the Wrench.

In the accompanying drawings, Figurel is a perspective view of our improved wrench when ready for use; Fig. 2, a vertical longitudinal section through the outer or handle end thereof 5 Fig. 3, a transverse section on the line u: ,fr of Fig. l, and Fig. 4 a similar section on` the line y y of Fig. l.

The main portion A ofthe wrench is provided with the usual head or jaw A, and with anges a a on its top edge next thereto. A longitudinal groove, d, is also formed in its outer or handle end, the object of whichwill presently be explained. The movable portion B of the wrench is provided with the usual head or jaw B', between which and the jaw of the main portion the nut or other object to be operated upon is, clamped. From this head or jaw B flanges b project, in which are formed grooves, as clearly shown in Fig. 4, which are adapted for the reception of the flanges a of the main portion of the wrench, and by which the parts are securely held together, while permitting of longitudinal adjustment. This portion B is also provided on its outer end with a depending tongue, b1, which is adapted to fit and Work in the longitudinal groove d of the portion A. Over this depending tongue b1, the outer end of which termi nates in an upwardly-projecting shoulder or lug, b2, and upon screw-threads o, formed upon the main portion of the wrench, is passed a nut, C 5 the object of which is, tthat when rotated in onedirection the heads or jaws of the wrench will be caused to approach each other by thenut acting upon the shoulder b3 of the portionB, to clamp upon any object over which they are placed, and by rotating itin the opposite direction the said jaws will be drawn apart by the nut acting on the shoulder b2 oi' the tongue-the object clamped by the jaws, if any, being consequently released.

It will be obvious that the shoulder on the end of the tongue will necessitate the placing of the nut over it, before its passage upon the screw-threads, and for the easy connection of the parts the iianges a a are beveled or cut away at the point a. (Best seen in Fig. l.)

We contemplate manufacturing our wrench of malleable metal, and without the usual Wooden handle, by which We secure a wrenchV easily and cheaply manufactured, while per feet in operation 5 one that occupies but little space in transportation, and one that under no circumstances, except breakage, is liable to get out of order.

It is obvious that the flanges and grooves on the respective portions of the wrench may V be transposed-that is, the straight i'langes may be formed upon the portion B, and the grooved i'langes upon the portion A-Without departing from the spirit of our invention.

The improved wrench hereinbefore set forth, consisting of the combination of the main portion, provided with a jaw, guidenanges, a longitudinal guidefgroove, and a screw; a movable portion, provided with a jaw, grooved anges interlocking with the guide-flanges on the main jaw, and a tongue working in the guide-groove, and a screw-nut Working on the screw of the main portion and over the sliding portion, for the purposes speciied.

p In testimony whereof we have hereunto subscribed our names.

ROBERT HALL MGCORMICK. WM. R. BAKER. Witnesses:

F. H. MATTHEWS, D. MGINTYRE. 

